Rolled Steel for Shipbuilding
(Inverted Angle)

Our inverted angles are a trusted choice in the shipbuilding industry, known for their exceptional quality, superior workability, and ease of installation. Designed to deliver reliable performance, they play a crucial role in ensuring the durability and efficiency of ship structures.

Shape/Dimensions Specifications

Cross-Section Dimensions / Cross-Sectional Area / Mass

Standard Cross-Section Dimensions (mm)	Cross-Sectional Area	Unit Mass
200×90 200×90	8 9	14 14	14 14	7 7	27.80 29.66	21.8 23.3
250×90 250×90 250×90 250×90	9 10 11 12	15 15 16 16	17 17 17 17	8.5 8.5 8.5 8.5	35.12 37.47 40.61 42.95	27.6 29.4 31.9 33.7
300×90 300×90 300×90	10 11 12	16 16 17	19 19 19	9.5 9.5 9.5	43.38 46.22 49.84	34.1 36.3 39.1

Standard Cross-Section Dimensions (mm)

Cross-Sectional Area

Unit Mass

A×B

t₁

t₂

r₁

r₂

（cm²）

（kg/m）

200×90

27.80

29.66

21.8

23.3

250×90

8.5

35.12

37.47

40.61

42.95

27.6

29.4

31.9

33.7

300×90

9.5

43.38

46.22

49.84

34.1

36.3

39.1

Type / Classification / Material Symbol

Type	Grade	Material Symbol
Type	Grade	NK	LR	DNV	BV	ABS	KR	GL	CCS	CR
Mild Steel	Grade A Steel	KA	A	NV A	A	A	A	GL-A	A	A
	Grade B Steel	KB	B	NV B	B	B	B	GL-B	B	B
	Grade D Steel	KD	D	NV D	D	D	D	GL-D	D	D
	Grade E Steel	KE	E	-	E	E	E	-	E	E
High-Strength Steel	32kg Class Steel	KA32 KD32 KE32	AH32 DH32 EH32	NV A32 NV D32	AH32 DH32 EH32	AH32 DH32 EH32	AH32 DH32 EH32	GL-A32 GL-D32	AH32 DH32 EH32	AH32 DH32 EH32
High-Strength Steel	36kg Class Steel	KA36 KD36 KE36	AH36 DH36 EH36	NV A36 NV D36	AH36 DH36 EH36	AH36 DH36 EH36	AH36 DH36 EH36	GL-A36 GL-D36	AH36 DH36 EH36	AH36 DH36 EH36

Chemical Composition

Type	Material Symbol	Deoxidation Process	Chemical Composition (%)
Type	Material Symbol	Deoxidation Process	C	Si	Mn	P	S	Cu
Mild Steel	KA	Killed	Below 0.21	Below 0.50	Above 2.5×C	Below 0.035	Below 0.035	-
	KB		Below 0.21	Below 0.35	Above 0.80
	KD		Below 0.21		Above 0.60
	KE	Fine Grain Killed	Below 0.18		Above 0.70
High-Strength Steel	KA32	Fine Grain Killed	Below 0.18	Below 0.50	0.90～1.60	Below 0.035	Below 0.035	Below 0.35
	KD32
	KE32
	KA36
	KD36
	KE36

Type	Material Symbol	Deoxidation Process	Chemical Composition (%)							Carbon Equivalent (%)
Type	Material Symbol	Deoxidation Process	Cr	Ni	Mo	T・AL	Nb	V	Ti	Carbon Equivalent (%)
Mild Steel	KA	Killed	-	-	-	-	-	-	-	-
	KB
	KD
	KE	Fine Grain Killed				Above 0.020
High-Strength Steel	KA32	Fine Grain Killed	Below 0.20	Below 0.40	Below 0.080	Above 0.020	0.020～0.050	0.050～0.100	Below 0.020	Below 0.36
	KD32
	KE32
	KA36
	KD36
	KE36